Method of cleaning using partially fluorinated alkanes having a tertiary structure as solvent

ABSTRACT

Novel partially fluorinated alkanes having the Formula: ##STR1## wherein each R is the same or different and is selected from the group consisting of CF 3 , CHF 2 , CH 2  F, and CH 3  CF 2 , and R&#39; is an alkyl or fluoroalkyl group having 1 to 6 carbon atoms with the proviso that when each R is CF 3 , R&#39; is not CF 3  (CF 2 ) 2  --, CF 3  CF 2  --, or CF 3  have utility as solvents in a variety of industrial cleaning applications including cold cleaning, dry cleaning, and defluxing of printed circuit boards.

This application is a division of application Ser. No. 546,067, filed June 29, 1990, now U.S. Pat. No. 5,059,728.

FIELD OF THE INVENTION

This invention relates to novel partially fluorinated alkanes having a tertiary structure and 4 to 9 carbon atoms. These compounds are useful in a variety of vapor degreasing, cold cleaning, and solvent cleaning applications including defluxing and dry cleaning.

CROSS-REFERENCE TO RELATED APPLICATION

Commonly assigned concurrently filed patent application U.S. Ser. No. 546,173 claims a method for preparing foam using a partially fluorinated alkane having four or five carbon atoms and a tertiary structure as a blowing agent.

BACKGROUND OF THE INVENTION

Cold cleaning is an application where numerous solvents are used. In most cold cleaning applications, the soiled part is either immersed in the fluid or wiped with rags or similar objects soaked in solvents and allowed to air dry.

In cold cleaning applications, the use of the aerosol packaging concept has long been found to be a convenient and cost effective means of dispensing solvents. Aerosol products utilize a propellant gas or mixture of propellant gases, preferably in a liquified gas rather than a compressed gas state, to generate sufficient pressure to expel the active ingredients, i.e. Product concentrates such as solvents, from the container upon opening of the aerosol valve. The propellants may be in direct contact with the solvent, as in most conventional aerosol systems, or may be isolated from the solvent, as in barrier-type aerosol systems.

Vapor degreasing and solvent cleaning with fluorocarbon based solvents have found widespread use in industry for the degreasing and otherwise cleaning of solid surfaces, especially intricate parts and difficult to remove soils.

In its simplest form, vapor degreasing or solvent cleaning consists of exposing a room temperature object to be cleaned to the vapors of a boiling solvent. Vapors condensing on the object provide clean distilled solvent to wash away grease or other contamination. Final evaporation of solvent from the object leaves behind no residue as would be the case where the object is simply washed in liquid solvent.

For difficult to remove soils where elevated temperature is necessary to improve the cleaning action of the solvent, or for large volume assembly line operations where the cleaning of metal parts and assemblies must be done efficiently and quickly, the conventional operation of a vapor degreaser consists of immersing the part to be cleaned in a sump of boiling solvent which removes the bulk of the soil, thereafter immersing the part in a sump containing freshly distilled solvent near room temperature, and finally exposing the part to solvent vapors over the boiling sump which condense on the cleaned part. In addition, the part can also be sprayed with distilled solvent before final rinsing.

Vapor degreasers suitable in the above-describe operations are well known in the art. For example, Sherliker et al. in U.S. Pat. No. 3,085,918 disclose such suitable vapor degreasers comprising a boiling sump, a clean sump, a water separator, and other ancillary equipment.

Chlorofluorocarbon solvents, such as trichlorotrifluoroethane, have attained widespread use in recent years as effective, nontoxic, and nonflammable agents useful in degreasing applications and other solvent cleaning applications. One isomer of trichlorotrifluoroethane is 1,1,2-trichloro-1,2,2-trifluoroethane (known in the art as CFC-113). CFC-113 has a boiling point of about 47° C and has been found to have satisfactory solvent power for greases, oils, waxes and the like. It has therefore found widespread use for cleaning electric motors, compressors, heavy metal parts, delicate precision metal parts, printed circuit boards, gyroscopes, guidance systems, aerospace and missile hardware, aluminum parts and the like.

Another commonly used solvent is chloroform (known in the art as HCC-20) which has a boiling point of about 63° C. Perchloroethylene is a commonly used dry cleaning and vapor degreasing solvent which has a boiling point of about 121° C. These compounds are disadvantageous for use as solvents because they are toxic; also, chloroform causes liver damage when inhaled in excess.

Although chlorine is known to contribute to the solvency capability of a compound, fully halogenated chlorofluorocarbons and hydrochlorocarbons are suspected of causing environmental problems in connection with the earth's Protective ozone layer. Thus, the art is seeking new compounds which do not contribute to environmental problems but yet provide the solvency properties of CFC-113. From an environmental standpoint, hydrofluorocarbon and hydrocarbon Compounds are of interest because they are considered to be stratospherically safe substitutes for the currently used fully halogenated chlorofluorocarbons. Mathematical models have substantiated that hydrofluorocarbons and hydrocarbons will not adversely affect atmospheric chemistry as not contributing to ozone depletion and to green-house global warming in comparison to the fully halogenated species.

The problems with hydrofluorocarbons as solvents are that known straight chain hydrofluorocarbons such as CH₃ (CF₂)₄ H and CH₃ CH₂ (CF₂)₃ H do not have the solvency power of CFC-113. A branched hydrofluorocarbon such as CF₃ CH(CF₃)₂ is nonflammable but has a boiling point of about 15° C. and thus, is not liquid at room temperature at atmospheric pressure and is not useful in cold cleaning applications. The problems with hydrocarbons as solvents are that branched hydrocarbons such as isobutane are flammable and have such low boiling points that they are not liquid at room temperature and are not useful in cold cleaning applications. The problem with alkanols as solvents is that branched alkanols such as isobutanol are flammable.

It is an object of this invention to provide novel hydrofluorocarbon compounds which are liquid at room temperature and which are useful as solvents for use in vapor degreasing, cold cleaning, and other solvent cleaning applications including defluxing applications and dry cleaning.

Another object of the invention is to provide novel environmentally acceptable solvents for use in the aforementioned applications.

Other objects and advantages of the invention will become apparent from the following description.

DETAILED DESCRIPTION OF THE INVENTION

We have found a novel class of hydrofluorocarbons which we believe have good solvency characteristics. The present novel compounds are of the Formula: ##STR2## wherein each R is the same or different and is selected from the group consisting of CF₃, CHF₂, CH₂ F, and CH₃ CF₂ --, and R' is an alkyl or fluoroalkyl group having 1 to 6 carbon atoms with the proviso that when each R is CF₃, R' is not CF₃ (CF₂)₂ --, CF₂ --, or CF₃.

Because C in the Formula above has three alkyl groups thereon, these novel compounds have a tertiary structure. We believe that this tertiary structure provides good solvency power. The R component of the Formula above helps to make the hydrogen of the Formula above more acidic and therefore, more polar; thus, when the present compounds are used as solvents, the compounds have good solvency power for polar contaminants such as polyols and amines. The R' component of the Formula above helps to make the compounds nonpolar; thus, when the present compounds are used as solvents, the compounds also have good solvency power for nonpolar contaminants including hydrocarbons such as mineral oil. We also believe that these novel compounds have boiling points in the range of about 35 to about 80° C. which are comparable to those of CFC-113 and chloroform.

Preferably, R' in the Formula above is selected from the group consisting of CF₃, CHF₂, CH₂ F, CH₃, CF₃ (CF₂)n--, CF₃ CF₂ CHF--, CF₃ CF₂ CH₂ --, CF₃ (CHF)n--, CF₃ CHFCF₂ --, CF₃ CHFCH₂ --, CF₃ (CH₂)_(n) --, CF₃ CH₂ CF₂ --, CF₃ CH₂ CHF--, CHF₂ (CF₂)_(n) --, CHF₂ CHFCF₂ --, CHF₂ CHFCH₂ --, CHF₂ (CHF)_(n) --, CHG₂ CHFCF₂ --, CHG₂ CHFCH₂ --, CHF₂ (CH₂)_(n) --, CHF₂ CH₂ CF₂ --, CHF₂ CH₂ CHF--, CH₂ F(CF₂)_(n) --, CH₂ FCF₂ CHF--, CH₂ FCF₂ CH₂ --, CH₂ F(CHF)_(n) --, CH₂ FCHFCF₂ --, CH₂ FCHFCH₂ --, CH₂ F(CH₂)_(n) --, CH₂ FCH₂ CF₂ --, CH₂ FCH₂ CHF--, CH₃ (CF₂)_(n) --, CH₃ CF₂ CHF--, CH₃ CF₂ CH₂ --, CH₃ (CHF)_(n) --, CH₃ CHFCF₂ --, CH₃ CHFCH₂ --, and CH₃ (CH₂)_(m) (CF₂)_(n), and m is 1 to 3, and n is 1 or 2 with the proviso that when each R is CF₃, R' is not CF₃, CF₃ CF₂ --, or CF₃ (CF₂)₂ --.

In the Formula above, when one R is CF₃, the other R is CHG₂, and R' is CH₃, the compound is 2-methyl-1,1,1,3,3-pentafluoropropane. When one R is CF₃, the other R is CH₂ F, and R' is CH₃, the compound is 2-methyl-1,1,1,3-tetrafluoropropane. When one R is CF₃, the other R is CH₂ F, and R' is CHG₂ CHF--, the compound is 2-fluoromethyl-1,1,1,3,4,4-hexafluorobutane. When one R is CF₃, the other R is CH₃ CF₂ --, and R' is CH₃, the compound is 2-methyl-1,1,1,3,3-pentafluorobutane. When one R is CHG₂, the other R is CH₂ F, and R' is CH₃, the compound is 2-methyl-1,1,3-trifluoropropane. When one R is CHG₂, the other R is CH₂ F, and R' is CHF₂ CH₂ --, the compound is 2-fluoromethyl-1,1,4,4-tetrafluorobutane.

The present novel compounds may be prepared by adapting known methods for preparing hydrofluorocarbons. For example, 2-methyl-1,1,1,3,3-pentafluoropropane may be prepared by reacting commercially available 1,1,1-trifluoro-2-propanone with CF₂ carbane to form 2-trifluoromethyl-1,1-difluoro-1-propene which may then be hydrogenated to form 2-methyl-1,1,1,3,3-pentafluoropropane.

As another example, 2-methyl-1,1,1,3-tetrafluoropropane may be prepared by reacting commercially available methacrylic acid with hydrogen fluoride to form 2-methyl-3-fluoropropanoic acid which may then be fluorinated to form 2-methyl-1,1,1,3-tetrafluoropropane.

As another example, 2-fluoromethyl-1,1,1,3,4,4-hexafluorobutane may be prepared by fluorinating commercially available 3-chloropropionic acid to form 1,1,1,3-tetrafluoropropane which may then be reacted with CHG₂ CF carbene to form 2-fluoromethyl-1,1,1,3,4,4-hexafluorobutane.

As another example, 2-methyl-1,1,1,3,3-pentafluorobutane may be prepared by fluorinating commercially available 2-methyl-1-buten-3-yne to form 3-methyl-1,2,3,4-tetrafluoro-1-butene which may then be reacted with hydrogen fluoride to form 2-methyl-1,2,3,3,4-pentafluorobutane. The 2-methyl-1,2,3,3,4-pentafluorobutane may then be dehalogenated to form 3-methyl-2,3,4-trifluoro-1-butene which may then be reacted with hydrogen fluoride to form 2-methyl-1,2,3,3-tetrafluorobutane. The 2-methyl-1,2,3,3-tetrafluorobutane may then be dehalogenated to form 2-methyl-1,3,3-trifluoro-1-butene which may then be fluorinated to form 2-methyl-1,1,2,3,3-pentafluorobutane. The 2-methyl-1,1,2,3,3-pentafluorobutane may then be dehydrohalogenated to form 2-methyl-1,1,3,3-tetrafluoro-1-butene which may then be reacted with hydrogen fluoride to form 2-methyl-1,1,1,3,3-pentafluorobutane. The boiling point of 2-methyl-1,1,1,3,3-pentafluorobutane is calculated to be about 60° C. Because of its boiling point, 2-methyl-1,1,1,3,3-pentafluorobutane would be particularly useful as a solvent substitute for chloroform.

For example, 2-methyl-1,1,3-trifluoropropane may be prepared by reacting commercially available fluoroacetone with a CF₂ carbene to form 2-fluoromethyl-1,1,3-trifluoro-1-propene which may then be hydrogenated to form 2-methyl-1,1,3-trifluoropropane.

As another example, 2-fluoromethyl-1,1,4,4-tetrafluorobutane may be prepared by oxidizing commercially available 3-fluoro-1,2-propanediol to form a product which may then be reacted with CF₂ carbene to form 2-fluoromethyl-1,1,4,4-tetrafluoro-1,3-butadiene which may then be hydrogenated to form 2-fluoromethyl-1,1,4,4-tetrafluorobutane.

Preferably, each R in the formula above is the same. When each R is CHG₂ and R' is CF₃, the compound is 2-difluoromethyl-1,1,1,3,3-pentafluoropropane. When each R is CHG₂ and R' is CHG₂, the compound is 2-difluoromethyl-1,1,3,3-tetrafluoropropane. When each R is CHG₂ and R' is CH₂ F, the compound is 2-fluoromethyl-1,1,3,3-tetrafluoropropane. When each R is CHF₂ and R' is CH₃, the compound is 2-methyl-1,1,3,3-tetrafluoropropane. When each R is CH₂ F and R' is CHF₂, the compound is 2-fluoromethyl-1,1,3-trifluoropropane. When each R is CH₂ F and R' is CH₂ F, the compound is 2-fluoromethyl-1,3-difluoropropane. When each R is CH₃ CF₂ -- and R' is CF₃, the compound is 3-trifluoromethyl-2,2,4,4-tetrafluoropentane.

As another preparation example, 2-difluoromethyl-1,1,1,3,3-pentafluoropropane may be prepared by fluorinating commercially available 1,1,1,3,3-pentachloro-2-propanone to form 1,1,1,3,3-pentafluoro-2-propanone which may then be reacted with CF₂ carbene to form 2-difluoromethyl-1,1,3,3,3-tetrafluoro-1-propene. The 2-difluoromethyl-1,1,3,3,3-tetrafluoro-1-propene may then be hydrogenated to form 2-difluoromethyl-1,1,1,3,3-pentafluoropropane.

As another example, the 2-difluoromethyl-1,1,3,3-tetrafluoropropane may be prepared by fluorinating commercially available 1,1,3-trichloro-2-propanone to form 1,1,3-trifluoro-2-propanone which may then be reacted with CF₂ carbene to form 2-fluoromethyl-1,1,3,3-tetrafluoro-1-propene. The 2-fluoromethyl-1,1,3,3-tetrafluoro-1-propene may then be hydrogenated to form 2-fluoromethyl-1,1,3,3-tetrafluoropropane. The 2-fluoromethyl-1,1,3,3-tetrafluoropropane may then be dehydrogenated to form 2-difluoromethyl-1,3,3-trifluoro-1-propene which may then be reacted with hydrogen fluoride to form 2-difluoromethyl-1,1,3,3-tetrafluoropropane.

As another example, 2-fluoromethyl-1,1,3,3-tetrafluoropropane may be prepared by fluorinating commercially available 1,1,3-trichloro-2-propanone to form 1,1,3-trifluoro-2-Propanone which may then be reacted with CF₂ carbene to form 2-fluoromethyl-1,1,3,3-tetrafluoro-1-propene. The 2-fluoromethyl-1,1,3,3-tetrafluoro-1-propene may then be hydrogenated to form 2-fluoromethyl-1,1,3,3-tetrafluoropropane.

As another example, 2-methyl-1,1,3,3-tetrafluoropropane may be prepared by fluorinating commercially available 1,1-dichloro-2-propanone to form 1,1-difluoro-2-propanone which may then be reacted with CF₂ carbene to form 2-methyl-1,1,3,3-tetrafluoro-1-propene. The 2-methyl-1,1,3,3-tetrafluoro-1-propene may then be hydrogenated to form 2-methyl-1,1,3,3-tetrafluoropropane.

As another example, the 2-fluoromethyl-1,1,3-trifluoropropane may be prepared by oxidizing commercially available 1,3-difluoro-2-propanol to 1,3-difluoro-2-propanone which may then be reacted with a CF₂ carbene to form 2-fluoromethyl-1,1,3-trifluoro-1-propene. The 2-fluoromethyl-1,1,3-trifluoro-1-propene may then be hydrogenated to form 2-fluoromethyl-1,1,3-trifluoropropane.

As another example, the 2-fluoromethyl-1,3-difluoropropane may be prepared by oxidizing commercially available 1,3-difluoro-2-propanol to 1,3-difluoro-2-propanone which may then be reacted with a CF₂ carbene to form 2-fluoromethyl-1,1,3-trifluoro-1-propene. The 2-fluoromethyl-1,1,3-trifluoro-1-propene may then be hydrogenated to form 2-fluoromethyl-1,1,3-trifluoropropane. The 2-fluoromethyl-1,1,3-trifluoropropane may then be dehydrohalogenated to form 2-fluoromethyl-1,3-difluoro-1-propene which may then be hydrogenated to form 2-fluoromethyl-1,3-difluoropropane.

As another example, the 3-trifluoromethyl-2,2,4,4-tetrafluoropentane may be prepared by fluorinating commercially available 2,4-pentanedione to form 2,2,4,4-tetrafluoropentane which may then be dehydrohalogenated to form 2,4,4-trifluoro-2-pentene. The 2,4,4-trifluoro-2-pentene may then be reacted with CF₃ to form 3-trifluoromethyl-2,2,4,4-tetrafluoropentane.

The boiling point of 2-difluoromethyl-1,1,3,3-tetrafluoropropane is calculated to be about 61° C. while the boiling point of 2-fluoromethyl-1,3-difluoropropane is calculated to be about 51° C. The boiling point of 3-trifluoromethyl-2,2,4,4-tetrafluoropentane is calculated to be about 52° C.

Because of its boiling point, 2-difluoromethyl-1,1,3,3-tetrafluoropropane would be particularly useful as a solvent substitute for chloroform. Because of their boiling points, 2-fluoromethyl-1,3-difluoropropane and 3-trifluoromethyl-2,2,4,4-tetrafluoropentane would be particularly useful as solvent substitutes for CFC-113.

More preferably, each R in the Formula above is CF₃. When R' is CF₃ CF₂ CHF--, the compound is 2-trifluoromethyl-1,1,1,3,4,4,5,5,5-nonafluoropentane. To prepare 2-trifluoromethyl-1,1,1,3,4,4,5,5,5-nonafluoropentane, commercially available hexafluoropropene may be oligomerized with commercially available trimethylamine in a dipolar aprotic solvent such as commercially available tetrahydrofuran to provide (CF₃)₂ C:CFCF₂ CF₃ as taught by W. Brunskill et al., "Anionic Oligomerisation of Hexafluoropropene: Fission of a Carbon-Carbon Bond by Fluoride Ion", Chemical Communications, 1444 (1970); the (CF₃)₂ C:CFCF₂ CF₃ may then be hydrogenated to form 2-trifluoromethyl-1,1,1,3,4,4,5,5,5-nonafluoropentane.

Most preferably, each R is CF₃ and R' is selected from the group consisting of CHF₂, CH₃, CF₃ CHF--, CF₃ CH₂ --, CHF₂ CH₂ --CH₃ CF₂ --, CH₃ (CF₂)₂ --, CH₃ CH₂ CF₂ --, and CH₃ CH₂ CF₂ CF₂ --. The names of the preceding preferred hydrofluorocarbons are 2-difluoromethyl-1,1,1,3,3,3-hexafluoropropane; 2-methyl-1,1,1,3,3,3-hexafluoropropane; 2-trifluoromethyl-1,1,1,3,4,4,4-heptafluorobutane; 2-trifluoromethyl-1,1,1,4,4,4-hexafluorobutane; 2-trifluoromethyl-1,1,1,4,4-pentafluorobutane; 2-trifluoromethyl-1,1,1,3,3-pentafluorobutane; 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluoropentane: 2-trifluoromethyl-1,1,1,3,3-pentafluoropentane; and 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluorohexane.

The present novel compounds may be prepared by adapting known methods for preparing hydrofluorocarbons. For example, 2-difluoromethyl-1,1,1,3,3,3-hexafluoropropane may be prepared by treating commercially available hexafluoropropene with hydrogen fluoride as taught by commonly assigned U.K. Patent 902,590 to form 1,1,1,2,3,3,3-hexafluoropropane. The 1,1,1,2,3,3,3-hexafluoropropane may then be heated at 475-700° C. in the presence of activated carbon as taught by commonly assigned U.S. Pat. No. 2,981,763 which is incorporated herein by reference to form 2-trifluoromethyl-1,1,1,3,3,3-hexafluoropropane or nonafluoroisobutane. The nonafluoroisobutane may then be treated with commercially available benzoyl chloride in the presence of commercially available triethylamine as taught by B. L. Dyatkin et al., "The Perfluoro-t-butyl Anion in the Synthesis of Organofluorine Compounds", Russian Chemical Reviews 45(7), 607 (1976) to form perfluoroisobutene. The perfluoroisobutene may then by hydrogenated to form 2-difluoromethyl-1,1,1,3,3,3-hexafluoropropane.

As another example, 2-methyl-1,1,1,3,3,3-hexafluoropropane may be prepared by reacting commercially available hexafluoropropene with elemental sulfur and commercially available potassium fluoride in commercially available dimethylformamide under substantially atmospheric pressure and at temperatures between 25-100° C. as taught by commonly assigned U.S. Pat. No. 4,326,068 which is incorporated herein by reference to form hexafluorothioacetone dimer. The hexafluorothioacetone dimer may then be reacted with commercially available formaldehyde as taught by commonly assigned U.S. Pat. No. 4,367,349 which is incorporated herein by reference to form hexafluoroisobutylene. The hexafluoroisobutylene may then be hydrogenated to form 2-methyl-1,1,1,3,3,3-hexafluoropropane.

As another example, 2-trifluoromethyl-1,1,1,3,4,4,4-heptafluorobutane may be prepared by reacting commercially available 1,1-difluoroethylene according to the procedure of George L. Fleming et al., "Addition of Free Radicals to Unsaturated Systems. Part XX. The Direction of Radical Addition of Heptafluoro-2-iodopropane to Vinyl Fluoride, Trifluoroethylene, and Hexafluoropropene", J. C. S. Perkin I, 574 (1973) to form a product which may then be fluorinated to form 2-trifluoromethyl-1,1,1,2,3,4,4,4-octafluorobutane. The 2-trifluoromethyl-1,1,1,2,3,4,4,4-octafluorobutane may then be dehydrohalogenated and then hydrogenated to form 2-trifluoromethyl-1,1,1,3,4,4,4-heptafluorobutane.

As another example, 2-trifluoromethyl-1,1,1,4,4,4-hexafluorobutane may be prepared by reacting commercially available 1,1-difluoroethylene according to the procedure of George L. Fleming et al., supra, to form a product which may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,1,2,4,4,4-hexafluorobutane which may then be dehydrohalogenated and then hydrogenated to form 2-trifluoromethyl-1,1,1,4,4,4-hexafluorobutane.

As another example, 2-trifluoromethyl-1,1,1,4,4-pentafluorobutane may be prepared by reacting commercially available 1,1-difluoroethylene according to the procedure of George L. Fleming et al., supra, to form a product which may then be hydrogenated to form 2-trifluoromethyl-1,1,1,2,4,4-hexafluorobutane which may then be dehydrohalogenated and then hydrogenated to form 2-trifluoromethyl-1,1,1,4,4-pentafluorobutane.

As another example, 2-trifluoromethyl-1,1,1,3,3-pentafluorobutane may be prepared by fluorinating commercially available 2-butanone to form 2,2-difluorobutane which may then be dehydrogenated to form 3,3-difluoro-1-butene. CF₃ may then be added to the 3,3-difluoro-1-butene to form 2-trifluoromethyl-1,3,3-trifluorobutane which may then be dehydrogenated to form 2-trifluoromethyl-1,3,3-trifluoro-1-butene. The 2-trifluoromethyl-1,3,3-trifluoro-1-butene may then be reacted with hydrogen fluoride to form 2-difluoromethyl-1,1,1,3,3,3-hexafluorobutane which may then be dehydrogenated to form 2-trifluoromethyl-1,1,3,3-tetrafluoro-1-butene which may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,1,3,3-pentafluorobutane.

As another example, 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluoropentane may be prepared by fluorinating commercially available 2,3-pentanedione to form 2,2,3,3-tetrafluoropentane which may then be dehydrogenated to form 3,3,4,4-tetrafluoro-1-pentene. CF₃ may then be added to the 3,3,4,4-tetrafluoro-1-pentene to form 2-trifluoromethyl-1,3,3,4,4-pentafluoropentane which may then be dehydrogenated to form 2-trifluoromethyl-1,3,3,4,4-pentafluoro-1-pentene. The 2-trifluoromethyl-1,3,3,4,4-pentafluoro-1-pentene may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,3,3,4,4-hexafluoropentane which may then be dehydrogenated to form 2-trifluoromethyl-1,1,3,3,4,4-hexafluoro-1-pentene which may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluoropentane.

As another example, 2-trifluoromethyl-1,1,1,3,3-pentafluoropentane may be prepared by fluorinating 3-pentanone to form 3,3-difluoropentane which may then be dehydrogenated to form 3,3-difluoro-1-pentene. CF₃ may then be reacted with the 3,3-difluoro-1-pentene to form 2-trifluoromethyl-1,3,3-trifluoropentane which may then be dehydrogenated to form 2-trifluoromethyl-1,3,3-trifluoro-1-pentene. The 2-trifluoromethyl-1,3,3-trifluoro-1-pentene may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,3,3-tetrafluoropentane which may then be dehydrogenated to form 2-trifluoromethyl-1,1,3,3-tetrafluoro-1-pentene which may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,1,3,3-pentafluoropentane.

As another example, 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluorohexane may be prepared by fluorinating commercially available 3,4-hexanedione to form 3,3,4,4-tetrafluorohexane which may then be dehydrogenated to form 3,3,4,4-tetrafluoro-1-hexene. CF₃ may then be added to the 3,3,4,4-tetrafluoro-1-hexene to form 2-trifluoromethyl-1,3,3,4,4-pentafluorohexane which may then be dehydrogenated to form 2-trifluoromethyl-1,3,3,4,4-pentafluoro-1-hexene. The 2-trifluoromethyl-1,3,3,4,4-pentafluoro-1-hexene may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,3,3,4,4-hexafluorohexane which may then be dehydrogenated to form 2-trifluoromethyl-1,1,3,3,4,4-hexafluoro-1-hexene which may then be reacted with hydrogen fluoride to form 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluorohexane.

The boiling point of 2-difluoromethyl-1,1,1,3,3,3-hexafluoropropane is calculated to be about 38° C while the boiling point of 2-methyl-1,1,1,3,3,3-hexafluoropropane is calculated to be about 30° C. The boiling point of 2-trifluoromethyl-1,1,1,4,4,4-hexafluorobutane is calculated to be about 75° C. The boiling point of 2-trifluoromethyl-1,1,1,3,3-pentafluoropentane is calculated to be about 38° C. while the boiling point of 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluorohexane is calculated to be about 55° C.

The present novel compounds are useful as solvents in a variety of vapor degreasing, cold cleaning, and solvent cleaning applications including defluxing and dry cleaning. Because of their boiling points, 2-difluoromethyl-1,1,1,3,3,3-hexafluoropropane, 2-methyl-1,1,1,3,3,3-hexafluoropropane, 2-trifluoromethyl-1,1,1,3,3-pentafluoropentane, and 2-trifluoromethyl-1,1,1,3,3,4,4-heptafluorohexane would be useful as solvent substitutes for CFC-113. Because of its boiling point, 2-trifluoromethyl-1,1,1,4,4,4-hexafluorobutane would be particularly useful as a solvent substitute for chloroform and perchloroethylene.

The present invention also provides a method of cleaning a solid surface which comprises treating the surface with a compound having the Formula: ##STR3## wherein each R is the same or different and is selected from the group consisting of CF₃, CHF₂, CH₂ F, and CH₃ CF₂, and R' is an alkyl or fluoroalkyl group having 1 to 6 carbon atoms.

Preferably, R' in the Formula above is selected from the group consisting of CF₃, CHF₂, CH₂ F, CH₃, CF₃ (CF₂)_(n) --, CF₃ CF₃ CF₂ CHF--, CF₃ CF₂ CH₂ --, CF₃ (CHF)_(n) --, CF₃ CHFCF₂ --, CF₃ CHFCH₂ --, CF₃ (CH₂)_(n) --, CF₃ CH₂ CF₂ --, CF₃ CH₂ CHF--, CHF₂ (CF₂)_(n) --, CHF₂ CF₂ CHF--, CHF₂ CF₂ CH₂ --, CHF₂ (CHF)_(n) --, CHF₂ CHFCF₂ --, CHF₂ CHFCH₂ --, CHF₂ (CH₂)_(n) --, CHF₂ CH₂ CF₂ --, CHF₂ CH₂ CHF--, CH₂ F(CF₂)_(n) --, CH₂ FCF₂ CHF--, CH₂ FCF₂ CH₂ --, CH₂ F(CHF)_(n) --, CH₂ FCHFCF₂ --, CH₂ FCHFCH₂ --, CH₂ F(CH₂)_(n) -- , CH₂ FCH₂ CF₂ --, CH₂ FCH₂ CHF--, CH₃ (CF₂)_(n) --, CH₃ CF₂ CHF--, CH₃ CF₂ CH₂ --, CH₃ (CHF)_(n) --, CH₃ CHFCF₂ --, CH₃ CHFCH₂ --, and CH₃ (CF₂)_(m) (CF₂)_(n), and m is 1 to 3, and n is 1 or 2.

Preferably, each R in the Formula above is the same and more preferably, each R in the Formula above is CF₃

When R' is CF₃ CF₂ CF₂ --, the compound is 2-trifluoromethyl-1,1,1,3,3,4,4,5,5,5-decafluoropentane. To prepare 2-trifluoromethyl-1,1,1,3,3,4,4,5,5,5-decafluoropentane, any method known in the art may be used. For example, commercially available hexafluoropropene may be oligomerized with commercially available trimethylamine in a dipolar aprotic solvent such as commercially available tetrahydrofuran to provide (CF₃)₂ C:CFCF₂ CF₃ which is then reacted with commercially available hydrogen fluoride to yield 2-trifluoromethyl-1,1,1,3,3,4,4,5,5,5-decafluoropentane as taught by W. Brunskill et al., "Anionic Oligomerisation of Hexafluoropropene: Fission of a Carbon-Carbon Bond by Fluoride Ion", Chemical Communications, 1444 (1970).

When R' is CF₃ CF₂ --, the compound is 2-trifluoromethyl- 1,1,1,3,3,4,4,4-octafluorobutane. To prepare 2-trifluoromethyl-1,1,1,3,3,4,4,4-octafluorobutane, any method known in the art may be used. For example, 2-trifluoromethyl-1,1,1,3,3,4,4,4-octafluorobutane may be prepared by reacting caesium fluoride and perfluoro-3-methylbutlene in moist sulpholan as taught by Robert N. Haszeldine et al., "Fluoro-olefin Chemistry. Part 11. Some Reactions of Perfluoro-3-methylbut-1-ene under Ionic and Free-radical Conditions", J. Chem. Soc. 565 (1979).

When R' is CF₃, the compound is 2-trifluoromethyl-1,1,1,3,3,3-hexafluoropropane To prepare 2-trifluoromethyl-1,1,1,3,3,3-hexafluoropropane, any method known in the art may be used. For example, commercially available hexafluoropropene may be reacted with hydrogen fluoride to form 1,1,1,2,3,3,3-heptafluoropropane which may then be heated at about 475-700° C. in the presence of activated carbon to form 2-trifluoromethyl-1,1,1,3,3,3-hexafluoropropane as taught by commonly assigned U.S. Pat. No. 2,981,763 which is incorporated herein by reference.

The boiling point of 2-trifluoromethyl-1,1,1,3,3,4,4,4-octafluorobutane is calculated to be about 47° C. Because of its boiling Point, 2-trifluoromethyl-1,1,1,3,3,4,4,4-octafluorobutane would be particularly useful as a solvent substitute for CFC-113.

In the process embodiment of the invention, the compositions may be used to clean solid surfaces by treating the surfaces with the compounds in any manner well known to the art such as by dipping or spraying or use of conventional degreasing apparatus.

When the novel compounds are used to clean solid surfaces by spraying the surfaces with the compounds, preferably, the novel compounds are sprayed onto the surfaces by using a propellant. Preferably, the propellant is selected from the group consisting of hydrochlorofluorocarbon, hydrofluorocarbon, and mixtures thereof. Useful hydrochlorofluorocarbon propellants include dichlorofluoromethane (known in the art as HCFC-21), chlorodifluoromethane (known in the art as HCFC-22), 1,1-dichloro-2,2-difluoroethane (known in the art as HCFC-132a), 1-chloro-2,2,2-trifluoroethane (known in the art as HCFC-133), and 1-chloro-1,1-difluoroethane (known in the art as HCFC-142b); commercially available HCFC-21, HCFC-22, and HCFC-142b may be used in the present invention. Useful hydrofluorocarbon propellants include trifluoromethane (known in the art as HFC-23), 1,1,1,2-tetrafluoroethane (known in the art as HFC-134a), and 1,1-difluoroethane (known in the art as HFC-152a); commercially available HFC-23 and HFC-152a may be used in the present invention. Until HFC-134a becomes available in commercial quantities, HFC-134a may be made by a known method such as that disclosed by U.S. Pat. No. 4,851,595. Preferred propellants include chlorodifluoromethane and 1,1,1,2-tetrafluoroethane.

The present partially fluorinated alkanes may also be used as blowing agents for preparing foam as disclosed in commonly assigned concurrently filed patent application U.S. Ser. No. 546,173, which is incorporated herein by reference.

The present invention is more fully illustrated by the following non-limiting Examples.

EXAMPLES 1-540

For each example, the novel compound of the Formula above having the R and R' groups as indicated in Table I below is made.

                  TABLE I                                                          ______________________________________                                         Example    R              R'                                                   ______________________________________                                          1         CF.sub.3, CHF.sub.2                                                                           CF.sub.3                                              2         CF.sub.3, CHF.sub.2                                                                           CHF.sub.2                                             3         CF.sub.3, CHF.sub.2                                                                           CH.sub.2 F                                            4         CF.sub.3, CHF.sub.2                                                                           CH.sub.3                                              5         CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CF.sub.2                                     6         CF.sub.3, CHF.sub.2                                                                           CF.sub.3 (CF.sub.2).sub.2                             7         CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CF.sub.2 CHF                                 8         CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CF.sub.2 CH.sub.2                            9         CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CHF                                          10        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 (CHF).sub.2                                  11        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CHFCF.sub.2                                  12        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CHFCH.sub.2                                  13        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CH.sub.2                                     14        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 (CH.sub.2).sub.2                             15        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CH.sub.2 CF.sub.2                            16        CF.sub.3, CHF.sub.2                                                                           CF.sub.3 CH.sub.2 CHF                                 17        CF.sub.3, CHF.sub.2                                                                           CHF.sub. 2 CF.sub.2                                   18        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 (CF.sub.2).sub.2                            19        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CF.sub.2 CHF                                20        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CF.sub.2 CH.sub.2                           21        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CHF                                         22        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 (CHF).sub.2                                 23        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CHFCF.sub.2                                 24        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CHFCH.sub.2                                 25        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CH.sub.2                                    26        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 (CH.sub.2).sub.2                            27        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CH.sub.2 CF.sub.2                           28        CF.sub.3, CHF.sub.2                                                                           CHF.sub.2 CH.sub.2 CHF                                29        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCF.sub.2                                    30        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 F(CF.sub.2).sub.2                            31        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCF.sub.2 CHF                                32        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCF.sub.2 CH.sub.2                           33        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCHF                                         34        CF.sub.3, CHF.sub.2                                                                           CH.sub. 2 F(CHF).sub.2                                35        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCHFCF.sub.2                                 36        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCHFCH.sub.2                                 37        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCH.sub.2                                    38        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 F(CH.sub.2).sub.2                            39        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCH.sub.2 CF.sub.2                           40        CF.sub.3, CHF.sub.2                                                                           CH.sub.2 FCH.sub.2 CHF                                41        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CF.sub.2                                     42        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 (CF.sub.2).sub.2                             43        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CF.sub.2 CHF                                 44        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CF.sub.2 CH.sub.2                            45        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CHF                                          46        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 (CHF).sub.2                                  47        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CHFCF.sub.2                                  48        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CHFCH.sub.2                                  49        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CH.sub.2 CF.sub.2                            50        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                    51        CF.sub.3, CHF.sub. 2                                                                          CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                    52        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2            53        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                    54        CF.sub.3, CHF.sub.2                                                                           CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2            55        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3                                              56        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2                                             57        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 F                                            58        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3                                              59        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CF.sub.2                                     60        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 (CF.sub.2).sub.2                             61        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CF.sub.2 CHF                                 62        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CF.sub.2 CH.sub.2                            63        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CHF                                          64        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 (CHF).sub.2                                  65        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CHFCF.sub.2                                  66        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CHFCH.sub.2                                   67       CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CH.sub.2                                     68        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 (CH.sub.2).sub.2                             69        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CH.sub.2 CF.sub.2                            70        CF.sub.3, CH.sub.2 F                                                                          CF.sub.3 CH.sub.2 CHF                                 71        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CF.sub.2                                    72        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 (CF.sub.2).sub.2                            73        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CF.sub.2 CHF                                74        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CF.sub.2 CH.sub.2                           75        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CHF                                         76        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 (CHF).sub.2                                 77        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CHFCF.sub.2                                 78        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CHFCH.sub.2                                 79        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CH.sub.2                                    80        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 (CH.sub.2).sub.2                            81        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CH.sub.2 CF.sub.2                           82        CF.sub.3, CH.sub.2 F                                                                          CHF.sub.2 CH.sub.2 CHF                                83        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCF.sub.2                                    84        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 F(CF.sub.2).sub.2                            85        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCF.sub.2 CHF                                86        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCF.sub.2 CH.sub.2                           87        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCHF                                         88        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 F(CHF).sub.2                                 89        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCHFCF.sub.2                                 90        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCHFCH.sub.2                                 91        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCH.sub.2                                    92        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 F(CH.sub.2).sub.2                            93        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCH.sub.2 CF.sub.2                           94        CF.sub.3, CH.sub.2 F                                                                          CH.sub.2 FCH.sub.2 CHF                                95        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CF.sub.2                                     96        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 (CF.sub.2).sub.2                             97        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CF.sub.2 CHF                                 98        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CF.sub.2 CH.sub.2                            99        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CHF                                         100        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 (CHF).sub.2                                 101        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CHFCF.sub.2                                 102        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CHFCH.sub.2                                 103        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CH.sub.2 CF.sub.2                           104        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   105        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   106        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           107        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   108        CF.sub.3, CH.sub.2 F                                                                          CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           109        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3                                             110        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2                                            111        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 F                                           112        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3                                             113        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CF.sub.2                                    114        CF.sub. 3, CH.sub.3 CF.sub.2                                                                  CF.sub.3 (CF.sub.2).sub.2                            115        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CF.sub.2 CHF                                116        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CF.sub.2 CH.sub.2                           117        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CHF                                         118        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 (CHF).sub.2                                 119        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CHFCF.sub.2                                 120        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CHFCH.sub.2                                 121        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CH.sub.2                                    122        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 (CH.sub.2).sub.2                            123        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CH.sub.2 CF.sub.2                           124        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CF.sub.3 CH.sub.2 CHF                                125        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CF.sub.2                                   126        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 (CF.sub.2).sub.2                           127        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CF.sub.2 CHF                               128        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CF.sub.2 CH.sub.2                          129        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CHF                                        130        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 (CHF).sub.2                                131        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CHFCF.sub.2                                132        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CHFCH.sub.2                                133        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CH.sub.2                                   134        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 (CH.sub.2).sub.2                           135        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CH.sub.2 CF.sub.2                          136        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CHF.sub.2 CH.sub.2 CHF                               137        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCF.sub.2                                   138        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 F(CF.sub.2).sub.2                           139        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCF.sub.2 CHF                               140        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCF.sub.2 CH.sub.2                          141        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCHF                                        142        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 F(CHF).sub.2                                143        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCHFCF.sub.2                                144        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCHFCH.sub.2                                145        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCH.sub.2                                   146        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 F(CH.sub.2).sub.2                           147        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCH.sub.2 CF.sub.2                          148        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.2 FCH.sub.2 CHF                               149        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CF.sub.2                                    150        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 (CF.sub.2).sub.2                            151        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CF.sub.2 CHF                                152        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CF.sub.2 CH.sub.2                           153        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CHF                                         154        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 (CHF).sub.2                                 155        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CHFCF.sub.2                                 156        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CHFCH.sub.2                                 157        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CH.sub.2 CF.sub.2                           158        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   159        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   160        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 (CH.sub.2 ).sub.2 (CF.sub.2).sub.2          161        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   162        CF.sub.3, CH.sub.3 CF.sub.2                                                                   CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           163        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3                                             164        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2                                            165        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 F                                           166        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3                                             167        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CF.sub.2                                    168        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 (CF.sub.2).sub.2                            169        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CF.sub.2 CHF                                170        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CF.sub.2 CH.sub.2                           171        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CHF                                         172        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 (CHF).sub.2                                 173        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CHFCF.sub.2                                 174        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CHFCH.sub.2                                 175        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CH.sub.2                                    176        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 (CH.sub.2).sub.2                            177        CHF.sub.2, CH.sub.2 F                                                                         CF.sub. 3 CH.sub.2 CF.sub.2                          178        CHF.sub.2, CH.sub.2 F                                                                         CF.sub.3 CH.sub.2 CHF                                179        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CF.sub.2                                   180        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 (CF.sub.2).sub.2                           181        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CF.sub.2 CHF                               182        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CF.sub.2 CH.sub.2                          183        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CHF                                        184        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 (CHF).sub.2                                185        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CHFCF.sub.2                                186        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CHFCH.sub.2                                187        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CH.sub.2                                   188        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 (CH.sub.2).sub.2                           189        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CH.sub.2 CF.sub.2                          190        CHF.sub.2, CH.sub.2 F                                                                         CHF.sub.2 CH.sub.2 CHF                               191        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCF.sub.2                                   192        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 F(CF.sub.2).sub.2                           193        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCF.sub.2 CHF                               194        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCF.sub.2 CH.sub.2                          195        CHF.sub.2 , CH.sub.2 F                                                                        CH.sub.2 FCHF                                        196        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 F(CHF).sub.2                                197        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCHFCF.sub.2                                198        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCHFCH.sub.2                                199        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCH.sub.2                                   200        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 F(CH.sub.2).sub.2                           201        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCH.sub.2 CF.sub.2                          202        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.2 FCH.sub.2 CHF                               203        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CF.sub.2                                    204        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 (CF.sub.2).sub.2                            205        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CF.sub.2 CHF                                206        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CF.sub.2 CH.sub.2                           207        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CHF                                         208        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 (CHF).sub.2                                 209        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CHFCF.sub.2                                 210        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CHFCH.sub.2                                 211        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 CH.sub.2 CF.sub.2                           212        CHF.sub.2, CH.sub.2 F                                                                         CH.sub. 3 CH.sub.2 (CF.sub.2).sub.2                  213        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   214        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           215        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   216        CHF.sub.2, CH.sub.2 F                                                                         CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           217        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3                                             218        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2                                            219        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 F                                           220        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3                                             221        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CF.sub.2                                    222        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 (CF.sub.2).sub.2                            223        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CF.sub.2 CHF                                224        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CF.sub.2 CH.sub.2                           225        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CHF                                         226        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 (CHF).sub.2                                 227        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CHFCF.sub.2                                 228        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CHFCH.sub.2                                 229        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CH.sub.2                                    230        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 (CH.sub.2).sub.2                            231        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CH.sub.2 CF.sub.2                           232        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CF.sub.3 CH.sub.2 CHF                                233        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CF.sub.2                                   234        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 (CF.sub.2).sub.2                           235        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CF.sub.2 CHF                               236        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CF.sub.2 CH.sub.2                          237        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CHF                                        238        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 (CHF).sub.2                                239        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CHFCF.sub.2                                240        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CHFCH.sub.2                                241        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CH.sub.2                                   242        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 (CH.sub.2).sub.2                           243        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub. 2 CH.sub.2 CF.sub.2                         244        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CHF.sub.2 CH.sub.2 CHF                               245        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCF.sub.2                                   246        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 F(CF.sub.2).sub.2                           247        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCF.sub.2 CHF                               248        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCF.sub.2 CH.sub.2                          249        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCHF                                        250        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 F(CHF).sub.2                                251        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCHFCF.sub.2                                252        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCHFCH.sub.2                                253        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCH.sub.2                                   254        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 F(CH.sub.2).sub.2                           255        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCH.sub.2 CF.sub.2                          256        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.2 FCH.sub.2 CHF                               257        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CF.sub.2                                    258        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 (CF.sub.2).sub.2                            259        CHF.sub.2 , CH.sub.3 CF.sub.2                                                                 CH.sub.3 CF.sub.2 CHF                                260        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CF.sub.2 CH.sub.2                           261        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CHF                                         262        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 (CHF).sub.2                                 263        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CHFCF.sub.2                                 264        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CHFCH.sub.2                                 265        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CH.sub.2 CF.sub.2                           266        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   267        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   268        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           269        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   270        CHF.sub.2, CH.sub.3 CF.sub.2                                                                  CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           271        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3                                             272        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2                                            273        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 F                                           274        CH.sub. 2 F, CH.sub.3 CF.sub.2                                                                CH.sub.3                                             275        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CF.sub.2                                    276        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 (CF.sub.2).sub.2                            277        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CF.sub.2 CHF                                278        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CF.sub.2 CH.sub.2                           279        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CHF                                         280        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 (CHF).sub.2                                 281        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.2 CHFCF.sub.2                                 282        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CHFCH.sub.2                                 283        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CH.sub.2                                    284        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 (CH.sub.2).sub.2                            285        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CH.sub.2 CF.sub.2                           286        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CF.sub.3 CH.sub.2 CHF                                287        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CF.sub.2                                   288        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 (CF.sub.2).sub.2                           289        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CF.sub.2 CHF                               290        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CF.sub.2 CH.sub.2                          291        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CHF                                        292        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 (CHF).sub.2                                293        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CHFCF.sub.2                                294        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CHFCH.sub.2                                295        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CH.sub.2                                   296        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 (CH.sub.2).sub.2                           297        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CH.sub.2 CF.sub.2                          298        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CHF.sub.2 CH.sub.2 CHF                               299        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCF.sub.2                                   300        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 F(CF.sub.2).sub.2                           301        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCF.sub.2 CHF                               302        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCF.sub.2 CH.sub.2                          303        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCHF                                        304        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 F(CHF).sub.2                                305        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCHFCF.sub.2                                306        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCHFCH.sub.2                                307        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCH.sub.2                                   308        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 F(CH.sub.2).sub.2                           309        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCH.sub.2 CF.sub.2                          310        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.2 FCH.sub.2 CHF                               311        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CF.sub.2                                    312        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 (CF.sub.2).sub.2                            313        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CF.sub.2 CHF                                314        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CF.sub.2 CH.sub.2                           315        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CHF                                         316        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 (CHF).sub.2                                 317        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CHFCF.sub.2                                 318        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CHFCH.sub.2                                 319        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CH.sub.2 CF.sub.2                           320        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   321        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   322        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           323        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   324        CH.sub.2 F, CH.sub.3 CF.sub.2                                                                 CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           325        CF.sub.3, CF.sub.3                                                                            CF.sub.3                                             326        CF.sub.3, CF.sub.3                                                                            CHF.sub.2                                            327        CF.sub.3, CF.sub.3                                                                            CH.sub.2 F                                           328        CF.sub.3, CF.sub.3                                                                            CH.sub.3                                             329        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CF.sub.2                                    330        CF.sub.3, CF.sub.3                                                                            CF.sub.3 (CF.sub.2).sub.2                            331        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CF.sub.2 CHF                                332        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CF.sub.2 CH.sub.2                           333        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CHF                                         334        CF.sub.3, CF.sub.3                                                                            CF.sub.3 (CHF).sub.2                                 335        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CHFCF.sub.2                                 336        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CHFCH.sub.2                                 337        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CH.sub.2                                    338        CF.sub.3, CF.sub.3                                                                            CF.sub.3 (CH.sub. 2).sub.2                           339        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CH.sub.2 CF.sub.2                           340        CF.sub.3, CF.sub.3                                                                            CF.sub.3 CH.sub.2 CHF                                341        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CF.sub.2                                   342        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 (CF.sub.2).sub.2                           343        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CF.sub.2 CHF                               344        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CF.sub.2 CH.sub.2                          345        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CHF                                        346        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 (CHF).sub.2                                347        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CHFCF.sub.2                                348        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CHFCH.sub.2                                349        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CH.sub.2                                   350        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 (CH.sub.2).sub.2                           351        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CH.sub.2 CF.sub.2                          352        CF.sub.3, CF.sub.3                                                                            CHF.sub.2 CH.sub.2 CHF                               353        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCF.sub.2                                   354        CF.sub.3, CF.sub.3                                                                            CH.sub.2 F(CF.sub.2).sub.2                           355        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCF.sub.2 CHF                               356        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCF.sub.2 CH.sub.2                          357        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCHF                                        358        CF.sub.3, CF.sub.3                                                                            CH.sub.2 F(CHF).sub.2                                359        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCHFCF.sub.2                                360        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCHFCH.sub.2                                361        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCH.sub.2                                   362        CF.sub.3, CF.sub.3                                                                            CH.sub.2 F(CH.sub.2).sub.2                           363        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCH.sub.2 CF.sub.2                          364        CF.sub.3, CF.sub.3                                                                            CH.sub.2 FCH.sub.2 CHF                               365        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CF.sub.2                                    366        CF.sub.3, CF.sub.3                                                                            CH.sub.3 (CF.sub.2).sub.2                            367        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CF.sub.2 CHF                                368        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CF.sub.2 CH.sub.2                           369        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CHF                                         370        CF.sub.3, CF.sub.3                                                                            CH.sub.3 (CHF).sub.2                                 371        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CHFCF.sub.2                                 372        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CHFCH.sub.2                                 373        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CH.sub.2 CF.sub.2                           374        CF.sub.3, CF.sub.3                                                                            CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   375        CF.sub.3, CF.sub.3                                                                            CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   376        CF.sub.3, CF.sub.3                                                                            CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           377        CF.sub.3, CF.sub.3                                                                            CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   378        CF.sub.3, CF.sub.3                                                                            CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           379        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3                                             380        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2                                            381        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 F                                           382        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3                                             383        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CF.sub.2                                    384        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 (CF.sub.2).sub.2                            385        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CF.sub.2 CHF                                386        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CF.sub.2 CH.sub.2                           387        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CHF                                         388        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 (CHF).sub.2                                 389        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CHFCF.sub.2                                 390        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CHFCH.sub.2                                 391        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CH.sub.2                                    392        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 (CH.sub.2).sub.2                            393        CHF.sub.2, CHF.sub.2                                                                          CF.sub. 3 CH.sub.2 CF.sub.2                          394        CHF.sub.2, CHF.sub.2                                                                          CF.sub.3 CH.sub.2 CHF                                395        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CF.sub.2                                   396        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 (CF.sub.2).sub.2                           397        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CF.sub.2 CHF                               398        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CF.sub.2 CH.sub.2                          399        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CHF                                        400        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 (CHF).sub.2                                401        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CHFCF.sub.2                                402        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CHFCH.sub.2                                403        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CH.sub.2                                   404        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 (CH.sub.2).sub.2                           405        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CH.sub.2 CF.sub.2                          406        CHF.sub.2, CHF.sub.2                                                                          CHF.sub.2 CH.sub.2 CHF                               407        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCF.sub.2                                   408        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 F(CF.sub.2).sub.2                           409        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCF.sub.2 CHF                               410        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCF.sub.2 CH.sub.2                          411        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCHF                                        412        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 F(CHF).sub.2                                413        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCHFCF.sub.2                                414        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCHFCH.sub.2                                415        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCH.sub.2                                   416        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 F(CH.sub.2).sub.2                           417        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCH.sub.2 CF.sub.2                          418        CHF.sub.2, CHF.sub.2                                                                          CH.sub.2 FCH.sub.2 CHF                               419        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CF.sub.2                                    420        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 (CF.sub.2).sub.2                            421        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CF.sub.2 CHF                                422        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CF.sub.2 CH.sub.2                           423        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CHF                                         424        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 (CHF).sub.2                                 425        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CHFCF.sub.2                                 426        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CHFCH.sub.2                                 427        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CH.sub.2 CF.sub.2                           428        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   429        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   430        CHF.sub. 2, CHF.sub.2                                                                         CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           431        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   432        CHF.sub.2, CHF.sub.2                                                                          CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           433        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3                                             434        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2                                            435        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 F                                           436        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3                                             437        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CF.sub.2                                    438        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 (CF.sub.2).sub.2                            439        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CF.sub.2 CHF                                440        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CF.sub.2 CH.sub.2                           441        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CHF                                         442        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 (CHF).sub.2                                 443        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CHFCF.sub.2                                 444        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CHFCH.sub.2                                 445        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CH.sub.2                                    446        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 (CH.sub.2).sub.2                            447        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CH.sub.2 CF.sub.2                           448        CH.sub.2 F, CH.sub.2 F                                                                        CF.sub.3 CH.sub.2 CHF                                449        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CF.sub.2                                   450        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 (CF.sub.2).sub.2                           451        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CF.sub.2 CHF                               452        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CF.sub.2 CH.sub.2                          453        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CHF                                        454        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 (CHF).sub.2                                455        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CHFCF.sub.2                                456        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CHFCH.sub.2                                457        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CH.sub.2                                   458        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 (CH.sub.2).sub.2                           459        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CH.sub.2 CF.sub.2                          460        CH.sub.2 F, CH.sub.2 F                                                                        CHF.sub.2 CH.sub.2 CHF                               461        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCF.sub.2                                   462        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 F(CF.sub.2).sub.2                           463        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCF.sub.2 CHF                               464        CH.sub. 2 F, CH.sub.2 F                                                                       CH.sub.2 FCF.sub.2 CH.sub.2                          465        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCHF                                        466        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 F(CHF).sub.2                                467        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCHFCF.sub.2                                468        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCHFCH.sub.2                                469        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCH.sub.2                                   470        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 F(CH.sub.2).sub.2                           471        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCH.sub.2 CF.sub.2                          472        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.2 FCH.sub.2 CHF                               473        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CF.sub.2                                    474        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 (CF.sub.2).sub.2                            475        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CF.sub.2 CHF                                476        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CF.sub.2 CH.sub.2                           477        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CHF                                         478        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 (CHF).sub.2                                 479        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CHFCF.sub.2                                 480        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CHFCH.sub.2                                 481        CH.sub.2 F, CH.sub. 2 F                                                                       CH.sub.3 CH.sub.2 CF.sub.2                           482        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   483        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   484        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           485        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   486        CH.sub.2 F, CH.sub.2 F                                                                        CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           487        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3                                             488        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2                                            489        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 F                                           490        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3                                             491        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CF.sub.2                                    492        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 (CF.sub.2).sub.2                            493        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CF.sub.2 CHF                                494        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CF.sub.2 CH.sub.2                           495        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CHF                                         496        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 (CHF).sub.2                                 497        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CHFCF.sub.2                                 498        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CHFCH.sub.2                                 499        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CH.sub.2                                    500        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 (CH.sub.2).sub.2                            501        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CH.sub.2 CF.sub.2                           502        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CF.sub.3 CH.sub.2 CHF                                503        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CF.sub.2                                   504        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 (CF.sub.2).sub.2                           505        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CF.sub.2 CHF                               506        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CF.sub.2 CH.sub.2                          507        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CHF                                        508        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 (CHF).sub. 2                               509        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CHFCF.sub.2                                510        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CHFCH.sub.2                                511        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CH.sub.2                                   512        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 (CH.sub.2).sub.2                           513        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CH.sub.2 CF.sub.2                          514        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CHF.sub.2 CH.sub.2 CHF                               515        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCF.sub.2                                   516        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 F(CF.sub.2).sub.2                           517        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCF.sub.2 CHF                               518        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCF.sub.2 CH.sub.2                          519        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCHF                                        520        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 F(CHF).sub.2                                521        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCHFCF.sub.2                                522        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCHFCH.sub.2                                523        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCH.sub.2                                   524        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 F(CH.sub.2).sub.2                           525        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCH.sub.2 CF.sub.2                          526        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.2 FCH.sub.2 CHF                               527        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CF.sub.2                                    528        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 (CF.sub.2).sub.2                            529        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CF.sub.2 CHF                                530        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CF.sub.2 CH.sub.2                           531        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CHF                                         532        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 (CHF).sub.2                                 533        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CHFCF.sub.2                                 534        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CHFCH.sub.2                                 535        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CH.sub.2 CF.sub.2                           536        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 CH.sub.2 (CF.sub.2).sub.2                   537        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 (CH.sub.2).sub.2 CF.sub.2                   538        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 (CH.sub.2).sub.2 (CF.sub.2).sub.2           539        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 (CH.sub.2).sub.3 CF.sub.2                   540        CH.sub.3 CF.sub.2, CH.sub.3 CF.sub.2                                                          CH.sub.3 (CH.sub.2).sub.3 (CF.sub.2).sub.2           ______________________________________                                    

EXAMPLES 541-1,080

Metal coupons are soiled with various types of oil. The soiled metal coupons are immersed in the novel solvents of Table I above for a period of 15 seconds to 2 minutes, removed, and allowed to air dry. Upon visual inspection, the soil appears to be substantially removed.

EXAMPLES 1,081-1,620

Metal coupons are soiled with various types of oil. The soiled metal coupons are wiped with the novel solvents of Table I above and allowed to air dry. Upon visual inspection, the soil appears to be substantially removed.

Having described the invention in detail and by reference to preferred embodiments thereof, it will be t that modifications and variations are possible without departing from the scope of the invention defined in the appended claims. 

What is claimed is:
 1. A method of cleaning a solid surface having contaminants thereon which comprises the steps of: said surface with a compound having the formula ##STR4## wherein each R is the same or different and is selected from the group consisting of CF₃, CHF₂, CH₂ F, and CH₃ CF₂, and R' is an alkyl or fluoroalkyl group having 1 to 6 carbon atoms and(B) substantially removing said contaminants and said compound from said surface.
 2. The method of claim 1 wherein said R' is selected from the group consisting of CF₃, CHF₂, CH₂ F, CH₃, CF₃ (CF₂)_(n) --, CF₃ CF₂ CHF--, CF₃ CF₂ CH₂ --, CF₃ (CHF)_(n) --, CF₃ CHFCF₂ --, CF₃ CHFCH₂ --, CF₃ (CH₂)_(n) --, CF₃ CH₂ CF₂ --, CF₃ CH₂ CHF--, CHF₃ (CF₂)_(n) --, CHF₂ CF₂ CHF--, CHF₂ CF₂ CH₂ --, CHF₂ (CHF)_(n) a--, CHF₂ CHFCF₂ --, CHF₂ CHFCH₂ --, CHF₂ (CH₂)_(n) --, CHF₂ CH₂ CF₂ --, CHF₂ CH₂ CHF--, CH₂ F(CF₂)_(n) --, CH₂ FCF₂ CHF--, CH₂ FCF₂ CH₂ --, CH₂ F(CHF)_(n) --, CH₂ FCHFCF₂ --, CH₂ FCHFCH₂ --, CH₂ F(CH₂).sub. n --, CH₂ FCH₂ CF₂ --, CH₂ FCH₂ CHF--, CH₃ (CF₂)_(n) --, CH₃ CF₂ CHF--, CH₃ CF₂ CH₂ --, CH₃ (CHF)_(n) --, CH₃ CHFCF₂ --, CH₃ CHFCH₂ --, and CH₃ (CH₂)_(m) (CF₂)_(n), and m is 1 to 3, and n is 1 or
 2. 3. The method of claim 1 wherein each of said R is the same.
 4. The method of claim 3 wherein each of said R is CF₃.
 5. The method of claim 4 wherein said R' is selected from the group consisting of CHF₂, CH₃, and CF₃ CH₂ --.
 6. The method of claim 5 wherein said R' is CHF₂.
 7. The method of claim 5 wherein said R' is CH₃.
 8. The method of claim 5 wherein said R' is CF₃ CH₂ --.
 9. The method of claim 4 wherein said R' is CF₃ CF₂ --.
 10. The method of claim 1 wherein said compound is selected from the group consisting of 2-difluoromethyl-1,1,3,3-tetrafluoropropane, 2-fluoromethyl-1,3-difluoropropane, and 3-trifluoromethyl-2,2,4,4-tetrafluoropentane.
 11. The method of claim 4 wherein said R' is selected from the group consisting of CH₃ CF₂ --, CH₃ (CF₂)₂ --, and CH₃ CH₂ CF₂ --.
 12. The method of claim 4 wherein said R' is CH₃ CF₂ --.
 13. The method of claim 4 wherein said R' is CH₃ (CF₂)₂ --.
 14. The method of claim 4 wherein said R' is CH₃ CH₂ CF₂ --. 